Preheating device.



e. VAN DAAM.

PREHEATING DEVICE.

APPLICATION FILED MAR. 27. I914.

P1165111 Sept. 28, 1915.

r a van DAAM, or BUFFALO, NEW roan.

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Specification of Letters Patent.

Application filed March 27, 1914. Serial No. 827,657.

' To all whom it may concern:

Be it known that ll, GERRIT VAN DnAM, a citizen of the United States, residing at Buffalo, in the county of Erie, State of New trate merely bty York, having invented a new and useful Preheating Device, of which the following is a specification.

My invention relates to improvements in means for facilitating combustion in boiler furnaces and the like.

The object is to provide improved means for delivering preheated air and pre-heated air and steam combined into the combustion chamber. 1

Referring to the drawings, which illuse'mbodiment my invention, Figure 1 is a longitudinal vertical section of a boiler furnace showing my improved means. Fig. 2 is a cross-section on line A-A of Fig. 1. Fig. 3 is a cross-section on line B-B of Fig. 1. Fig. 4 is a sectional detail.

Similar numerals refer to similar parts throughout the several views.

5 is a conductor having an intake for air outside of the furnace walls, as at '6. From conductor 5 air is delivered through pipe 7 pipe 8 and the undulated pipe 9 branching therefrom, and delivering to the converging extensions 10 and 11 provided with the. discharge vents 12. These discharge vents deliver to a channel 13 in the brid e wall 14 of the combustion chamber 15. The pipe 9 is undulated in order to add to its heating extension. As this pipe 9 and the extensions 10 and 11 are embedded in the structure of the bridge wall, the air assing'therethrough becomes very effective y hiaated, and the ordinary draft of the furnace secures an eflicient fiow of air from conductor 5 to the extensions 10 and 11 and through the discharge vents 12, at a point where it may be eficiently mixed with'the gasesarising in the fuel bed to facilitate in the combustion thereof. From the same conductor 5 alsoleads a pipe. 16 which delivers to a branch 17 which delivers to the pipes 18 and 19 located in theside walls 20 and 21 of the furnaces. Pipes 18 and 19 are undulated so as to add to the heating extension thereof.

Pipes 18 and 19 deliver to ipes 22 and 23 respectively, which aredoub ed back and extend in a horizontal plane above the said pipes-18 and 19. These pipes 22 and 23 are provided with the discharge vents 24 which deliver into the channels 25 of the walls 20 way of example, a suitable and 21 which open into the combustion chamber 15. Leading also from conductor 5 is the pipe 26 which projects beneath the grate toward the front of the furnace, where it delivers to the upright pipe 27 which in turn delivers to the undulated pipe 28 which leads by return bends to the two horizontal extensions 29 and 30, which deliver to the injector nozzles 31 and '32. These injector nozzles are provided with the needle valvecontrolled vents 33, which are connected by the pipes 34: through the superheating devices 35 and the pipe 36, with the source of steam supply 37, so that superheated steam may be injected through the needle controlled vent 33 into the nozzle 31 to mingle and drive therethrough the heated air elivered from 29 and 30. A hand-operated valve 39 is provided on the steam pipe 36 as an additional control to the hand-oper- Patented Sept.28,1915.

ated needle valve 40. It will thus be seen a that the air delivered to 31 and 32 has become thoroughly heated by passing through pipe 26 close'beneath the grate bars '38 and then-through the undulate piping 28 in the front wall of the combustion chamber. It will thus be seen that means are provided for the abundant supply of pre-heated air to the combustion chamber of the furnace to secure the complete combustion of the gases arising from the fuel bed before the same escape to the stack. That is to say, the pre-heated air is discharged over the fuel bed through the discharge vents 24 on either side of the longitudinal extension of the combustion chamber.- Pre-heated air is also discharged through the discharge vents 12 located in the bridge wall at 'a critical point where the gases would normally escape over said bridge wall, and where desirable hot air and super-heated dry steammay be injected through the injector nozzles 30 and 31 from the forward end of the fuel chamber. In this way is prevented any possibility of unconsumed gasesescaping from the combuswhich in turn delivers to an undulating pipe extension Which in turn delivers to a return horizontal extension delivering to an injector, said injector comprising a boll-shaped discharge nozzle and a needle valve controled steam jet delivering thereto.

2. The combination with the combustion chamber, of meansfor delivering hot air and superheated steam mixed together, above the fuel bed, comprising an inclined, flaring-mouth, bell-shaped delivery nozzle, a conductor leading thereto from a preheated air supply and a cooperating needlevalve-controlled nozzle located Within the first mentioned nozzle and forming an integral part thereof, said needle-valve-com trolled nozzle being connected with a preheated steam supply and delivering at substantially the same inclination as said first mentioned nozzle. GERRIT VAN DAAM. Witnesses:

MAE HOFMANN, RA PH H. GAMBLE. 

